Adjustable PCV

What they claim to address are issues that I have had to deal with on my engines. I have had PCVs flutter at idle and have had them let too much air past sometimes and then not at others. Which caused me to chase my idle all the time. And I have had oil leaks on my big displacement engines that were directly related to crankcase pressure. I prefer not to use pan-e-vacs on my street cars so this just might be of some value. It is worth $100 to find out.